...BTW your Bieber avatar is awesome.-Malone
are those the ones that the IP runs off oil pressure? If so and you have an oil leak at the back of the engine that could be it too. I would do the simple filter and the other stuff suggested too.
Check the oil to see if it's diluted with fuel.
You can check the fuel pressure at the fuel filter. There is a fitting on the filter housing for checking the pressure.